Pneumatic tire.



I PATENTED MAR. 14, 1905.

T. GIARA. PNEUMATIC TIRE.

APPLICATION FILED APE.19.1904.

Patented March 14, 1905.

TULLIO GIARA, OF BOSTON, MASSACHUSETTS.

PNEUMATIC TIRE.

SPECIFICATION or i g P Of Letters Patent N o. 7 84,7 38, dated March 14,1905.

Application filed April 19, 1904. Serial No. 203,908.

To (all whom it may concern."

Be it known that I. TULLIO GIARA, a subjeet of the King of Italy, and aresident of Boston, in the county of Suffolk and State of Massachusetts,have invented certain new and useful Improy ements in Pneumatic Tires,of which the following is a specification.

My invention relates to improvements in pneumatic tires, and especiallyto a protective shield which has for its object to prevent theair-chamber from being punctured by nails or like articles which may cutthrough the outer tube surrounding the inner tube which forms theair-chamber.

In carrying out this invention'the protective shield is placed insidethe tire between the inner and-outer tubes.

My invention consists of certain novel features hereinafter described,and particularly pointed out in the claims.

In the accompanying drawings, which illustrate a construction embodyingmy invention,

- Figure l is a vertical section of a cycle-rim with a tire constructedaccordingto my invention. Fig. 2 is a detail plan view, partly insection, of the improved protective shield.

Fig. 3 is a longitudinal sectional'view through the protective shield.Fig. I is a vertical cross-section on the line X X, Fig. 2, through theprotective shield.

Like letters of reference refer to like parts throughout the severalviews.

On the rim A is located the inner tube O, constituting the air chamber,and held in place on the rim by the tube B, asshown, or in any otherdesired manner. Located over the inner tube is a layer D, of preparedcloth, and between said layer of cloth and the outer tube B is locatedthe protective shield, which consists of compressed layers Gr and H, ofcotton, which have been previously subjected to the action of a suitablesolution to give them the proper binding property, and, if desired, tothe action of an oxid to cause them to retain their flexibility. Thelayer G is turned in at the edges, as shown in Fig. 2, and its oppositelayer H is formed with a series of pockets J in the manner indicated inFig. 3, and in these pockets are located flexible thin overlapping steelplates K in the form of scales. Against the back of the layer H is apiece of gummed cloth L. These three layers of cloth are in-.

closed by sheets of rubber F F or directlyvulcanized rubber, and all theparts are then fixed together to hold each part in a determinedposition, so that the parts cannot shift after the shield has beenplaced in position between the outer and the inner tube. These thinflexible steel plates give elasticity to the tire in contradistinctionto rigid sheets of metal, which reduce the elasticity of the tire. Asshown, the shield E is thinner at its edges than at the middle andcurved in accordance with the inner tube O forming the air-chainber andof such size as to cause a nail or other cutting-surface which maypierce the tirecover to come into contact with the flexible metal platesand prevent puncture of the airchamber. It will be understood that theshield being light and flexible will yield to any cutting-surface whichpierces the outer tube and compresses the air-chamber it surrounds, thefibers and the thin metal plates preventing the cutting-surface frompassing through the inner tube and puncturing the airchamber.

The rubber sheets F F prevent the entrance of water to the steel platesK, thereby preventing oxidation of said steel plates, which would causethem to break. After a nail or other sharp surface has passed throughthe outer tube and has come into contact with the shield and has beenwithdrawn the rubber of the shield closes up and prevents entrance ofwater to the steel plates.

I do not limit myself to the arrangement and construction shown, as thesame may be varied without departing from the spirit of my invention.

In practice it may be desirable to cement the protective shield to theinside of the tube, so that when the parts are assembled the shield willremain in its proper position.

Having thus described the nature of my invention and set forth aconstruction embodying the same, what I claim as new, and desire tosecure by Letters Patent of the United States, is-

1. A protecting-shield for tires consisting of layers of textilematerial treated with a binding substance to stick them together andwith a flexibility-retaining substance, metal plates inel'osed by saidlayers of textile material, and a rubber covering inelosing said layersof textile material.

2. A protecting-shield for tires consisting of layers of textilematerial treated with a binding substance to stick them together andwith a flexibility-retaining substance, overlapping metal platesinclosed by said layers of textile material, and a rubber coveringinclosing said layers of textile material.

3. A protecting-shield for tires consisting of layers of textilematerial treated with a binding substance to stick them together,overlapping metal plates inclosed by said layers of textile material,and a rubber covering inclosing said layers of textile material.

TULLIO GIARA.

itnesses:

A. L. MEssEo, A. R. LARRABEE.

